The Dallas Cowboys signed Treyvon Mullen in December when a slew of injuries affected the secondary and the team needed depth. But he’s out … and Tyler Coyle is in. FRISCO – The Baltimore Ravens have claimed former Dallas Cowboys cornerback Trayvon Mullen off waivers. Mullen, as it happens, is also the cousin of Ravens quarterback Lamar Jackson. … though he might not be the Ravens QB for long, given the state of contract negotiations. Meanwhile, Dallas has made a move with another DB, signing Tyler Coyle to a futures deal. Coyle, 24, went undrafted out of Connecticut in 2021…